Ken Knapp
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I don't believe the "steam" test is an accepted accelerated long term degradation test applicable to the oral environment or that this Scientdirect publication was peer reviewed. How many of the patients would survive with steam directed in the oral cavity, 0 patients would survive more than a day or two??Respectfully, I have spoken with many ceramic engineers that all work for zirconia manufacturers. All have said the HT 1100 MPa generation materials do loose flexural strength over time. Here is a published article that confirms this notion. Interesting, 3M zirconia was one of the sample materials used in the study.
http://www.sciencedirect.com/science/article/pii/S0022391312601668
Please note, in this study there was no longer term data that related to 5 years but the degradation was still significant.